CYRUS DVD6 TECHNICAL DESCRIPTION
© Cyrus Electronics Ltd Dec 2003
Cyrus DVD6 Service Manual Issue 1
11
Audio filter power supply
The unregulated DC to feed the audio filter regulators is derived from the high voltage secondary
winding via D503 and C547/8. A pair of adjustable regulators regulate the supply to ±12V (one
positive VR501, one negative VR507).
Digital power supply
The digital circuit supply is derived from a full bridge rectifier D502, smoothed by C501. Due to
the current demands on this supply, two regulators are used, VR505/6. Both are mounted to a
heatsink to improve power dissipation. A +5V digital supply is driven by a fixed voltage, low
dropout (2940-5.0) regulator VR505. This provides a supply for the microprocessor section, and all
associated control circuitry.
Video power supply
Power for the video buffers is derived from the ±12V analogue supplies. Using fixed voltage
regulators to generate the ±8V supplies, these are further regulated to ±5V using simple transistor
regulators.